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8mm Drive Ratio

Top Pulley

43

44

45

46

47

48

49

50

51

52

53

54

55

56

43

1.0

-2.3

-4.5

-6.5

-8.5

-10.4

-12.2

-14.0

-15.7

-17.3

-18.9

-20.4

-21.8

-23.2

44

1.0

1.0

-2.3

-4.3

-6.4

-8.3

-10.2

-12.0

-13.7

-15.4

-17.0

-18.5

-20.0

-21.4

45

4.7

2.3

1.0

-2.2

-4.3

-6.2

-8.2

-10.0

-11.8

-13.5

-15.1

-16.7

-18.2

-19.6

46

7.0

4.5

2.2

1.0

-2.1

-4.2

-6.1

-8.0

-9.8

-11.5

-13.2

-16.4

-16.4

-17.9

47

9.3

6.8

4.4

2.2

1.0

-2.1

-4.1

-6.0

-7.2

-9.6

-11.3

-13.0

-14.5

-16.1

B

48

11.6

9.1

6.7

4.3

2.1

1.0

2.0

-4.0

-5.9

-7.7

-9.4

-11.1

-12.7

-14.3

O

49

14.0

11.4

8.9

6.5

4.3

2.1

1.0

-2.0

-3.9

-5.8

-7.5

-9.3

-10.9

-12.5

T

50

16.3

13.6

11.1

8.7

6.4

4.2

2.0

1.0

-2.0

-3.8

-5.7

-7.4

-9.4

-10.7

T

51

18.6

15.9

13.3

10.9

8.5

6.3

4.1

2.0

1.0

-1.9

-3.8

-5.6

-7.3

-8.9

O

52

20.9

18.2

15.6

13.0

10.6

8.3

6.1

4.0

2.0

0.0

-1.9

-3.7

-5.5

-7.1

M

53

23.2

20.5

17.8

15.2

12.8

10.4

8.2

6.0

3.9

1.9

0.0

-1.9

-3.6

-5.4

54

25.5

22.7

20.0

17.4

14.9

12.5

10.2

8.0

5.9

3.8

1.9

0.0

-1.8

-3.6

P

55

27.9

25.0

22.2

19.6

17.0

14.6

12.2

10.0

7.8

5.8

3.8

1.9

0.0

-1.8

U

56

30.2

27.3

24.4

21.7

19.1

16.7

14.3

12.0

9.8

7.7

5.7

3.7

1.8

0.0

L

57

32.5

29.5

26.7

23.9

21.3

18.8

16.3

14.0

11.8

9.6

7.5

5.6

3.6

1.8

L

58

34.8

31.9

28.9

26.1

23.4

20.8

18.4

16.0

13.7

11.5

9.4

7.4

5.5

3.6

E

59

37.2

34.1

31.3

28.3

25.5

22.9

20.4

18.0

15.7

13.5

11.3

9.3

7.3

5.4

Y

60

39.5

36.4

33.3

30.4

27.7

25.0

22.4

20.0

17.6

15.4

13.2

11.1

9.1

7.1

61

41.8

38.6

35.6

32.6

29.8

27.1

24.5

22.0

19.6

17.3

15.1

13.0

10.9

8.9

62

44.2

40.9

37.8

34.8

31.9

29.2

26.5

24.0

21.6

19.2

17.0

14.8

12.7

10.7

63

46.5

43.2

40.0

37.0

34.0

31.1

28.6

26.0

23.5

21.2

18.9

16.7

14.5

12.5

64

48.8

45.5

42.2

39.1

36.2

33.3

30.6

28.0

25.5

23.1

20.8

18.5

16.4

14.3

65

51.2

47.7

44.4

41.3

38.3

35.4

32.7

30.0

27.5

25.0

22.6

20.4

18.2

16.1

66

53.5

50.0

46.7

43.5

40.4

37.5

34.7

32.0

29.4

26.9

24.5

22.2

20.0

17.9

67

55.8

52.3

48.9

45.6

42.6

39.6

36.7

34.0

31.4

28.8

26.4

24.1

21.8

19.6

68

58.1

54.5

51.1

47.8

44.7

41.7

38.8

36.0

33.3

30.8

28.3

25.9

23.6

21.4

69

60.5

56.8

53.3

50.0

46.8

43.8

40.8

38.0

35.3

32.7

30.2

27.8

25.5

23.2

70

62.8

59.1

55.6

52.2

48.9

45.8

42.9

40.0

37.3

34.6

32.1

29.6

27.3

25.0

Top Pulley (8mm Cont.)

57

58

59

60

61

62

63

64

65

66

67

68

69

70

43

-24.6

-25.9

-27.1

-28.3

-29.5

-30.6

-31.7

-32.8

-33.8

-34.8

-35.8

-36.8

-37.7

-38.6

44

-22.8

-24.1

-25.4

-26.7

-27.9

-29.0

-30.2

-31.2

-32.3

-33.3

-34.3

-35.3

-36.2

-37.1

45

-21.1

-22.4

-23.7

-25.0

-26.2

-27.4

-28.6

-29.7

-30.8

-31.9

32.8

-33.8

-34.8

-35.7

46

-19.3

-20.7

-22.0

-23.3

-24.6

-25.8

-27.0

-28.1

-29.2

-30.3

-31.3

-32.4

-33.3

-34.3

47

-17.5

-19.0

-20.3

-21.7

-23.0

-24.4

-25.4

-26.6

-27.7

-28.8

-29.9

-30.9

-31.9

-32.9
B

48

-15.8

-17.2

-18.6

-20.0

-21.3

-22.6

-23.8

-25.0

-26.2

-27.3

-28.4

-29.4

-30.4

-31.4

O

49

-14.0

-15.5

-16.9

-18.3

-19.7

-21.0

-22.2

-23.4

-24.6

-25.8

-26.9

-27.9

-29.0

-30.0

T

50

-12.3

-13.8

-15.3

-16.7

-18.0

-19.4

-20.0

-21.9

-23.1

-24.2

-25.4

-26.5

-27.5

-28.6

T

51

-10.5

-12.1

-13.6

-15.0

-16.4

-17.7

-19.0

-20.3

-21.5

-22.7

-23.9

-25.0

-26.1

-27.1

O

52

-8.8

-10.3

-11.9

-13.3

-14.8

-16.1

-17.5

-18.8

-20.0

-21.2

-22.4

-23.5

-24.6

-25.7

M

53

-7.0

-8.6

-10.2

-11.7

-13.1

-14.5

-15.9

-17.2

-18.5

-19.7

-20.9

-22.1

-23.2

-24.3

54

-5.3

-6.9

-8.5

-10.0

-11.5

-12.9

-14.3

-15.6

-16.9

-18.2

-19.4

-20.6

-21.7

-22.9
P

55

-3.5

-5.2

-6.8

-8.3

-9.8

-11.3

-12.7

-14.1

-15.4

-16.7

-17.9

-19.1

-20.3

-21.4
U

56

-1.8

-3.4

-5.1

-6.7

-8.2

-9.7

-11.1

-12.5

-13.8

-15.2

-16.4

-17.6

-18.8

-20.0
L

57

0.0

-1.7

-3.4

-5.0

-6.6

-8.1

-9.5

-10.9

-12.3

-13.6

-14.9

-16.2

-17.4

-18.6
L

58

1.8

0.0

-1.7

-3.3

-4.9

-6.5

-7.9

-9.4

-10.8

-12.1

-13.4

-14.7

-15.9

-17.1
E

59

3.5

1.7

0.0

-1.7

-3.3

-4.8

-6.3

-7.8

-9.2

-10.6

-11.9

-13.2

-14.5

-15.7
Y

60

5.3

3.4

1.7

0.0

-1.6

-3.2

-4.8

-6.3

-7.7

-9.1

-10.4

-11.8

-13.0

-14.3

61

7.0

5.2

3.4

1.7

0.0

-1.6

-3.2

-4.7

-6.2

-7.6

-9.0

-10.3

-11.6

-12.9

62

8.8

6.9

5.1

3.3

1.6

0.0

-1.6

-3.1

-4.6

-6.1

-7.5

-8.8

-10.1

-11.4

53

10.5

8.9

6.8

5.0

3.3

1.6

0.0

-1.6

-3.1

-4.5

-6.0

-7.4

-8.7

-10.0

64

12.3

10.3

8.5

6.7

4.9

3.2

1.6

0.0

-1.5

-3.0

-4.5

-5.9

-7.2

-8.6

65

14.0

12.1

10.2

8.3

6.6

4.8

3.2

1.6

0.0

-1.5

-3.0

-4.4

-5.8

-7.1

66

15.8

13.8

11.9

10.0

8.2

6.5

4.8

3.1

1.5

0.0

-1.5

-2.9

-4.3

-5.7

67

17.5

15.5

13.6

11.7

9.8

8.1

6.3

4.7

3.1

1.5

0.0

-1.5

-2.9

-4.3

68

19.3

17.2

15.3

13.3

11.5

9.7

7.9

6.3

4.6

3.0

1.5

0.0

-1.4

-2.9

69

21.1

19.0

16.9

15.0

13.1

11.3

9.5

7.8

6.2

4.5

3.0

1.5

0.0

-1.4

70

22.8

20.7

18.6

16.7

14.8

12.9

11.1

9.4

7.7

6.1

4.5

2.9

1.4

0.0

 

13.9mm & 14mm  (Same for 1/2" Pitch)

Top Pulley

  25 26 27 28 29 30 31 32 33 34 35 36 37
25 1.0 -3.8 -7.4 -10.7 -13.8 -16.7 -19.4 -21.9 -24.2 -26.5 -28.6 -30.6 -32.4
26 4.0 1.0 -3.7 -7.1 -10.3 -13.3 -16.1 -18.7 -21.2 -23.5 -25.7 -27.8 -29.7
27 8.0 3.8 1.0 -3.6 -6.9 -10.0 -12.9 -15.6 -18.2 -20.6 -22.9 -25.0 -27.0
28 12.0 7.7 3.7 1.0 -3.4 -6.7 -9.7 -12.5 -15.2 -17.6 -20.0 -22.2 -24.3
29 16.0 11.5 7.4 3.6 1.0 -3.3 -6.5 -9.4 -12.1 -14.7 -17.1 -19.4 -21.6
30 20.0 15.4 11.1 7.1 3.4 1.0 -3.2 -6.2 -9.1 -11.8 -14.3 -16.7 -18.9
31 24.0 19.2 14.8 10.7 6.9 3.3 1.0 -3.1 -6.1 -8.8 -11.4 -13.9 -16.2
32 28.0 23.1 18.5 14.3 10.3 6.7 3.2 1.0 -3.0 -5.9 -8.6 -11.1 -13.5
33 32.0 26.9 22.2 17.9 13.8 10.0 6.5 3.1 1.0 -2.9 -5.7 -8.3 -10.8
34 36.0 30.8 25.9 21.4 17.2 13.3 9.7 6.3 3.0 1.0 -2.9 -5.6 -8.1
35 40.0 34.6 29.6 25.0 20.7 16.7 12.9 9.4 6.7 2.9 1.0 -2.8 -5.4
36 44.0 38.5 33.3 28.6 24.1 20.0 16.1 12.5 9.1 5.9 2.9 1.0 -2.7
37 48.0 42.3 37.0 32.1 27.6 23.3 19.4 15.6 12.1 8.8 5.7 2.8 1.0
38 52.0 46.2 40.7 35.7 31.0 26.7 22.6 18.8 15.2 11.8 8.6 5.6 2.7
39 56.0 50.0 44.4 39.3 34.5 30.0 25.8 21.9 18.2 14.7 11.4 8.3 5.4
40 60.0 53.8 48.1 42.9 37.9 33.3 29.0 25.0 21.2 17.6 14.3 11.1 8.1
41 64.0 57.7 51.9 46.4 41.4 36.7 32.3 28.1 24.2 20.6 17.1 13.9 10.8
42 68.0 61.5 55.6 50.0 44.8 40.0 35.5 31.3 27.3 23.5 20.0 16.7 13.5
43 72.0 65.4 59.3 53.6 48.3 43.3 38.7 34.4 30.3 26.5 22.9 19.4 16.2
44 76.0 69.2 63.0 57.1 51.7 46.7 41.9 37.5 33.3 29.4 25.7 22.2 18.9
45 80.0 73.1 66.7 60.7 55.2 50.0 45.2 40.6 36.4 32.4 28.6 25.0 21.6

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